No Mercy

A former hand-to-hand combat instructor in the Korean Army, In-ae, seeks to take revenge when her younger sister Eun-hye disappears and she finds out that Eun-hye suffered violence and sexual abuse from school bullies, politicians, and gangsters. In-ae's ruthless pursuit of Eun-hye's abductors and traffickers leads her on a dangerous and thrilling adventure, where she will stop at nothing to punish those who took her sister.

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Some movies that have similar genres and were produced around the same time as No Mercy include Den of Thieves, The Killer, Spiderhead, The Instigators, Fast Charlie, A Score to Settle.